气体继电器安装方式和全密封变压器注油工艺是主要影响因素。
The way of installing QJ-40 gas-pressure relay and the oil injection craftwork of transformer are key influencing factors.
安装，更换和修复照明灯具和电气控制及配电设备，如开关，继电器和断路器面板。
Install, replace and repair lighting fixtures and electrical control and distribution equipment, such as switches, relays and circuit breaker panels.
通过内部安装控制继电器，特殊控制开关进行操作就如同电磁阀一样。
Special control switch setup operates like a solenoid valve through internally mounted control relay.
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